FORTUNE's annual ranking of America's leading businesswomen

In July, Comcast-controlled NBCU named Fili-Krushel to head up a new group, overseeing a lucrative but battle-scarred portfolio that includes NBC News, MSNBC, CNBC, and the Weather
Channel. A trusted lieutenant of NBCU honcho Steve Burke, Fili-Krushel needs to revive Today's sliding ratings.

From the October 8, 2012 issue

How we pick the Power 50

The list is compiled by FORTUNE editors, who consider four criteria: the size and importance of the woman's business in the global economy, the health and direction of the business, the
arc of the woman's career (resume and runway ahead), and societal and cultural influence.